Artificial tooth.



No. 663,72I. 4 Patnted Deb. ll, I900.

n. BREWSTER. ARTIFICIAL TOOTH. (Ap plicatiog filed Jan. 16, 1900) No Model.)

m n 0 m al to'nneq UNITED STATES PATIENT @rtmia ROBERT BREWSTER, OF CHICAGO, ILLINOIS.

ARTIFICIAL TooTI-I.

SPECIFICATION foriniiog part of Letters Patent No. 663,721, dated December I1, 1966.

Application filed January 18, 1900. Serial No. 1,907. tNo model.)

To all whom it may concern:

Be it known that I, ROBERT BREWSTER, a subject of the Queen of Great Britain, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Artificial Teeth,of which the following is a specification.

' My invention relates to improvementsin artificial teeth constructed and adapted substant-ially as herein shown and described.

In the accompanying drawings, Figure 1 is a perspective View showing two bicuspids of my invention swung in between a cuspid and a molar to form a posterior bridge. Fig. 2 is a cross-sectional view of my improved tooth, showing it connected to a backing or bridge. Fig. 3 is a longitudinal sectional view of my improved tooth, showing the plate and backing attached thereto. Fig. 4 is a similar view of a bicuspid or molar. Fig. 5 is a detached perspective view of the backing which has been fitted to the base of the tooth. Fig. 6 is a detached perspective view of the combined backing and anchor plate.

My improved tooth A is constructed separate from the means of attachment and is provided in its baseor lingual surface with a longitudinal elongated slot at, which is preferably enlarged on its approximal sides, as shown at b. The means of attachment consists of the separate anchor-plate c, which has its outer end f projecting and adapted to pass through the backing g. The form of the plate 0 is not essential so long as it is of the flattened character.

I am aware that teeth have been attached through the medium of cement and pins whereby anew tooth can be substituted for a broken tooth. I am also aware that an anchor-plate of the flat character has been baked in a tooth and made a permanent part thereof.

My invention differs essentially from the form of removable or replaceable tooth heretofore used in that the backing for said tooth previously in use is of a fixed form, absolutely preventing any variation being made by the dentist in the form or contour of the base of the tooth to adapt it to the conditions of the case at hand.

In the case of the flat plate baked in the tooth in the course of its manufacture the By means of a tooth and parts constructed according to my invention and described herein the dentist is enabled to construct dentures of a kind hitherto impossible. He has areplaceable tooth which has no metal baked within it. He is enabled to grind the tooth at its base to suit the anatomical conditions of the case to which it is to be applied. He is enabled to construct an anterior bridge with the desirable cleansing-space and yet have removable teeth and ample strength both in teeth and bridge to withstand all pressure from mastication.

A bridge constructed with my improved teeth while being possible of repair without removal from the mouth occupies less space labiolingually and has more strength than any other form of bridge known to me.

The saving of the dentists time owing to the simplicity of adapting backings to my improved teeth and the reduced cost of these backings by reason of their covering only a small surface of the tooth render the invention of much value to the profession and to the public.

The tooth, the anchor-plate, and the backing being separate, the dentist can grind the tooth to suit the anatomical conditions of his case and then adapthis piece of thin flat metal to t e tooth and form his backing. He then pass s a flattened piece of metal through this hacking into the elongated slot in the tooth, holds them together temporarily with wax, withdraws them from the tooth, and solders the parts together. In the construction of a bridge this backing and plate form one section. When the several sections which are to constitute the bridge are thus prepared, they are assembled with the teeth in position and waxed together and tried in the mouth and properly occluded. The teeth are then removed and the metal parts invested and soldered together, the teeth being afterward placed on their respective projecting plates and secured or attached with gutta-percha or other suitable material.

Havingthus described my invention, what I claim, and desire to secure by Letters Patent, is

An improved artificial tooth and backing attachment for application to bridgework comprising an improved artificial tooth having an elongated slot in its base or lingual surface, extending into but not through the crown of the tooth whereby the tooth may be ground at said surface to adapt it to the varying anatomical conditions met with in the mouth, a separate flat backing having a slot and adapted to be conformed to the shape of tially as'described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

ROBERT BREWSTER.

Witnesses:

' WM. H. GLAVIER,

W. R. J ONES. 

